1、2 Functions: UV filter has 2 functions. One is to prevent ultraviolet radiation, weaken the blue tone in the image caused by ultraviolet radiation, and ensure the clarity and color. The other is to give protection to the lens from dust and scratches. 2、Double Sided 18 Layers Coating: The double sided 18 layer optical coating can effectively reduce the surface reflection of the filter, reduce the glare and shadow caused by the reflection of external light after a long exposure, and ensure good image quality. 3、Optical Glass: The UV protection filter adopts pure transparent optical glass, and the coating technology is used to weaken the local exposure and truly achieve HD image quality. 4、Wide Angle Lens: The filter is only 3.15mm thick, and the double sided polishing technology is used to ensure there is no dark angle. Even on the telephoto lens, the image is still clear enough. 5、Good Anti Oil Stain Performance: The anti oil stain coating layer makes the lens surface glossy and clean, not easy to stain, effectively gives protection to the lens, and is suitable for photographers to create in a bad environment. Item Type: UV filter Material: Optical glass, aluminum alloy Number of Coating Layers: 18 layers on both sides Frame Thickness: About 3.15mm/0.1in 1 x UV Filter 1 x Filter Box